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S. A. CHASE. DUPLEX FIRE TELEGRAPH.

No. 404,519. Patented June 4, 1889.

. IAH/ IVTOH, 7 4M WITNESSES:

ATTORNEYS N4 PETERS. Pllolo-Lllhngraphcr, Washingum DI C.

UNITED STATES PATENT ()FFICE.

SIDNEY A. CHASE, OF EVART, MICHIGAN, ASSIGNOR- OF ONE-HALF TO 'WILLIAMR. MAPES, OF SAME PLACE.

DUPLEX FIRE-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 404,519, dated June 4,1889.

App m v filed September 11, 1888- Serial No. 285,114. (No modelil iclass of fire and. analogous telegraphic systems of the non-interferingtype, and its objects are, first, to provide a system of fire or policetelegraphs of duplex type in which the signal is transmitted at the sameinstant of time by two independent lines or routes to a central orreceiving station, or will be transmitted to either of two receiverslocated at said station in the event of either line breaking; second, toprovide means for breakinga normally-closed shunt around the transmitterin the signaling-box, and at the same time connecting said transmitterto either of said lines or routes; and, third, to accomplish variousfeatures,which will be hereinafter noted in connection with thedescription of the system and its mode of operation. I accomplish theseobjects by the system of circuits and arrangement of parts hereinafterdescribed, and particularly pointed out in the claims which follow thisspecification.

My invention will be fully understood by referring to the drawings whichaccompany the specification, and in which Figure l is a diagrammaticview showing the circuit-connections, together with a detail view of theoperative parts of one of the signaling-boxes. Fig. 2 is a similar Viewwith a modified form of signal-transmitter; and Fig. 3 is a detail viewof the transmitter shown in Fig. 2, showing the several parts detachedor separated.

In a prior application for a patent filed by me in the United StatesPatent Oflice April 9, 1888, hearing Serial No. 270,114, I have shown,described, and claimed an improved system of duplex fire or policetelegraphs not substantially different in its general details ofcircuits and central-station apparatusfrom that shown in the presentapplication, and the generic features of such system are shown anddescribed here only to exemplify the operation of my improvements hereindescribed and claimed.

I make no claim here to the system as a whole, the present applicationbeing directed to the specific features hereinafter claimed.

Referring to the drawings, WV W is a main or all-wire circuit connectednormally through a shunt around each signal-transmitter in each outlyingsignal-box, and also to an electro-magnet M in the central or alarmstation 0, and through a circuit-closer a .9, held closed by thearmature-lever A.

WV IV are normally-open earth-wires connected through two independentreceiving-re. lays or signal-receivers, preferably Morse penrecorders,or the same letters WV. W represent in dotted lines in both figures anall-wire,

return-circuit connected to the earth-wires W at each box, said wiresbeing disconnected from earth when the all-wire circuit is used.

B A and B A are the signaling-batteries, located in the normally-openearth-circuits.

1, 2, 3, 4, and 5 are the signal-boxes.

B A is the primary signal. and circuit controlling battery, acting tohold the signal-circuit W IV closed at points 0/. s. r

a a are circuit-controlling springs, and p p are contacts for saidsprings, said parts beingadapted to contact under the action ofarmature-lever A on its back action under influence of its spring.

Gr is the primary or preliminary signal-instrument in a normally-open shunt-circuit W to battery B A, open at p s.

The system as described so far is identical in its construction withthat described and claimed in my prior application above referred to,and needs no furthermention here.

In the application referred to the signaltransmitter was so constructedand arranged that the same signal was transmitted first by one route andthen the other alternately or successively, while in the presentimprovement I so arrange the signal-contacts on the two disks D D thatthe impulses go in both directions simultaneously, thus duplexing thesignal on the recorders at the central station, or, in the event of twosignals being turned in at the sameinstant, then one will go by oneroute and the other by the remaining routes, as described in my priorapplication.

The circuit is closed as follows: From bat tery B A throughcircuit'elosing springs s a, wire \V, magnet M, wire \V, boxes at 5, inthe same manner as in box 1, where the route is by wires \V \V, toeircuit-slnmting springs C C',wires \V \W, out of box, and back throughboxes 2 and 3 to the other pole of the battery. This holdsarmature-lever A up and leaves the shunt and signal-circuits W \Y open.The signal-transmitter, of the usual rotary spring-impelled type, has ahandle L and an arm M with insulation atits end, and adapted, when thebox is run down, to close the shunt ing-springs O 0, thereby shuntingthe sign alwheels D I) out of circuit.

A modified form of shnut-controller is shown in box 1, Fig. 2, in whichthe ordinary pulllever L is of bell-crank pat-tern and has connected toit a pivoted arm M, which in turn is connected to an arm F, carrying aninsulating-block. lVhen the arm L is pulled down, the insulated block isthrust under the shunting-sprin U (1, thereby breaking the shunt andpermitting the signal to go to the right and left over wire \V, as shownby arrows A A Fig. 3 shows in detail the signal-transmitter composed ofthree disks I) D D The cen tral disk D is of metal, and contactscontinuously with the spring ll, while disks 1) l) have the signaldisposed on their surfaces at the same side, and are connectedelectrically to disk I.) through the .common axle.

An examination of the drawings, Fig. 2, will reveal thecircuit-connections,in which disk D transmits to the right and D to theleft simultaneously if both wires \V V are intact.

The operation of the form shown in Figs 1 is as follows: On taking holdof handle L and rotating the transmitter in the direction of the arrowthe arm M is carried to the left and the shunt through the box about thetransmitter is broken. At the same time the magnet M at central stationis demagnetized and the signaling-circuits closed from batteries 13 A 3A through recorders or signal-recei vers R R, as described in my priorapplication. Signal-disks D l) commence to rotate on releasing handle L,and as the teeth of the transmitter pass beneath springs ll ll thecurrent from batteries B A and B A is either earthed at E E E or sent bydiverse routes through wires \V \V, the signal going in at the same timein both directions, or ii. either route be broken then by the one leftintact.

The preliminary signal in gong G will. of course be sounded, asdescribed in said prior application.

there be a slight difference in. time between the pulls. In the modified:torm shown in Fig. 2 the operation differs from that already describedonly in the fact that the contacts arin s C C are disconnectedelectricall b l s g the insulation on arm F.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. In a system 01: fire-alarm or analogous signals, the combination of atwo-way transmitter composed of two signal-disks having acharacter-signal on each disk. and contactsprings, with anormally-closed circuit shunting the transmitter and including in itscircuit a circuit-closer and an electro-magnct located at asignal-reeeivin g station, the circuit-closer being held closed by thearmature of the magnet, and one or morenormally-open signal-receivingcircuits, including one or more signal-receiving instruments, thecontact making and breaking devices representing the characteristicsignals being located on the same side of the disks, so that bothsignals are transn'iitted simultaneously, or so that the signal is sentin by whichever of the two lines ren'lains intact, substantially asdescribed.

2. A signal-transmitter for use in a duplex system of fire or analogoussignals, consisting of three disks, two of which have a definite signalon the same side of their periphery, the third having constant metalliccontact with an earth-circuit, while the others are connected byindividual. contact-springs and normally-open main-line circuits runningby diverse routes to a receiving-station, said main lines includingreceiving-instruments, substantially as described.

3. A signal-transmitter for use in duplex fire or analogous systems ofsignals, consisting of a mechanically-impelled motor geared to asignal-wheel composed of two signaldisks havingtwo characteristicsignals-one on each diskand located between the same radial portions ofsaid disks, in combination with two main-line circuits running bydiverse routes to a signal-receivingstation,and a shunt around saidtransmitter, ineludin g a circuit-breaker normally held closed by an armconnected to the motorshaft, substantially as described.

4. In a duplex fire, police, or analogous sys tem of signals, thecombination of the following elements: two reeeiving-instruments locatedin normally-open earth-circuits at a signal-receivin g station, anindependent all-metallic circuit including one or more outlyingsignal-boxes and an electro-magnet and circuit-closer held closed by thearmature of said magnet, a two-way signal-transmitter in each boxconnected to a normally-open. earthcircuit, and a shunt around saidsigi'ial-transmitter held normally closed by a motor which propels thesignal-transmitter, the latter having its duplicate signals in the sameradial position, so that as it rotates duplicate located innormally-open earth-circuits, sub-.

stantially as described.

6. A signal-transmitter for use in a duplex system of fire, police, oranalogous signals, consisting of two disks which have each a definitesignal located on the same side of its periphery, having constantelectric connection with an earth-circuit, and having open-circuitindependent contact-springs, and circuit-connections bran chin g toclosed main-line circuits running by diverse routes to areceiving-station, said main line containing receiving-instruments,substantially as described.

7. In a non-interfering fire, police, or analogous signaling system, aduplex signal-transmitter composed of two duplicate signalingdisks eachhaving the same characteristic signal located on the same radial portionof its circumference, in combination with normally-open circuitsignaling contact-springs and circuit-connections, an earth-circuit diskhaving a continually-closed ground-circuit connection, an automaticcircuit-changer at the receiving-station, having earth-circuits andnormally-open circui t-connections, whereby duplicate signals may besent simultaneously to the receiving-station in opposite directions atevery revolution of the signalingcircuit disks, substantially asdescribed.

8. A signal-transmitter for use in a duplex fire, police, or analogoussystem of signals, consisting of a mechanically-impelled motor geared toa signal-wheel composed of two signaling-disks having duplicate signalson the same radial portions of their circumferences and continuouselectric connection'with an earth-circuit, in combination withindependent normally-open circuit signaling contactsprings andcircuit-connections connected to opposite sides of a normally-closedshunt-cin cuit closer, connected in a metallic circuit shunting thetransmitter, said circuit running to a central station, including anelectro-magnet-ic circuit-changer and armature, and contacts andconnections which connect independent earth-circuits, includingreceiVing-instru ments, whereby duplicate signals are transmittedsimultaneously, substantially as described.

9. In a duplex fire, police, or analogous signaling system, thecombination of the following elements: a main all-wire closed metalliccircuit W, normally-open receiving earth-circuits WV, transmitterground-circuits W with a series of duplex transmitters normally shuntedout of the main circuit, but connected continually to earth-circuits,said transmitters composed of duplicate signaling -disks andcontinuity-preserving disks with definite signals located on the sameradial portions of the circumferences of the transmitters, substantiallyas described.

SIDNEY A. CHASE.

lVit-nessesz E. O. CANNON, BARLow DAVIS.

